I've never had data loss with ReiserFS 3. I did lose my configs with Ext4, though. But if you want all out performance, I hear ReiserFS 4 is where it's at, and it's also slated for kernel inclusion (2.6.33 I think)._________________Glock 32 Gen 4

Yes, ReiserFS 4 seems promising, with Reiser 3 I couldn't live with mount times, too long (particulary with >1T partitions). I'm using EXT4 since Jan'09 without any problems. EXT2 for /boot and EXT4 for everything else.